I thought in a hurricane, the pressure dropped. It is about 32 hours before land fall and the pressure is rising. Any one know why?
-
The barometric pressure is rising because you are reading the pressure outside of the Storm. The Storm itself is a giant low pressure area. That means the area outside of it is naturally higher pressure. The higher cooler air is rushing into Irene. (High flows to Low in a counter clockwise rotation) So the approaching Low that is Irene is pulling high pressure are toward it. Thus you see a rise in barometric pressure and a corresponding drop in temperature.
As Irene gets closer, the winds caused by the High Pressure flowing more energetically towards the Storm, will being to pick up velocity. So you may initially see a rise in pressure, drop in temperature and increase in wind velocity before Irene even gets here.
*
As Irene gets closer, the winds caused by the High Pressure flowing more energetically towards the Storm, will being to pick up velocity. So you may initially see a rise in pressure, drop in temperature and increase in wind velocity before Irene even gets here.
*
-
a little earlier today, irene weakened a bit. some dry air got mixed in & took it down a notch. the pressure could go back down if no more dry air goes into the system. the pressure drops as it builds, but that's no guarantee it'll stay low all the way to landfall.